Can you reuse a needle to draw and then inject?

The standard safety rule is one needle, one syringe, one time. A needle counts as dirty the moment it has been used, and it should not be used again to draw or inject. Poking the rubber vial top again and again with the same needle can also shave tiny bits of rubber into the liquid. That risk is lower with a fine insulin needle than with a bigger one, but it is not zero.

Full injecting guide: sites, needles, rotation, safety

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of injecting: sites, needles and safety. Subcutaneous vs intramuscular, site rotation, lipohypertrophy, needle length and gauge, vial hygiene at injection time, travel syringes, scar tissue, and when to stop and see a clinician. Full walkthrough at /injecting.